Using the Milwaukee M12 FUEL 3/8" Right Angle Impact Wrench is easy. First, make sure you have a compatible MILWAUKEE M12 REDLITHIUM Battery Pack (not included). Attach the battery to the tool. Then, select the appropriate mode from the 4 - Mode Drive Control depending on your task. For precise work, use Modes 1 - 3 to adjust RPM and IPM. When you need to remove a bolt, you can use Mode 4 with Bolt Removal Mode in reverse. When tightening bolts, the Auto Shut - off Mode in forward will prevent over - tightening. Be careful when using the tool in tight spaces. Make sure your hands are clear of moving parts. When the tool starts to overheat or shows signs of overload, stop using it immediately to prevent damage. After each use, clean the tool with a dry cloth. Store it in a dry and cool place. Check the battery regularly for proper charging and don't over - discharge it. If you notice any issues with the tool, have it inspected by a professional.